Install Alpine Linux in chroot on a device

This is a branch of original script intended for quick Alpine setup on a device with low capabilities.

Tested on a router with AsusWRT-Merlin and Entware

Why

Because Alpine is ideal for running containerized services.

Even though chroot is not a container.

Modifications to original script

• APK_TOOLS_URI and APK_TOOLS_SHA256 defaults are set to aarch64 binary.
• busybox-suid and musl-utils are removed from base install.
• ALPINE_PACKAGES are set to empty list.
• Shebang is modified to use Entware bash (built-in busybox does not provide getopts).

Requirements

Installation script requires following Entware packages to be installed:

• coreutils-id
• coreutils-mktemp (optional)
• bash
• coreutils-sha256sum

List may appear incomplete.

curl or wget, chroot, sed and other basic commands are provided by AsusWRT-Merlin.

Installation

• Download raw script.
• chmod +x alpine-chroot-install
• ./alpine-chroot-install -h for usage. Default CHROOT_DIR is most likely not where you want to install.
• ./alpine-chroot-install -d CHROOT_DIR.

Uninstallation

Warning! Don't rm -rf the chrooted directory while it has bind-mounted directories inside. Use the created $CHROOT_DIR/destroy script.

Warning! Run the destroy script using its canonical absolute path, otherwise it can miss mounted directories.

More

Also see the original README.